Concept:Water transport depends on fixed routes on seas, rivers, and canals, which makes it inflexible.
Explanation:Ships and boats must follow available waterways, so they cannot reach every destination directly.
Road and rail transport can be extended or redirected; water transport cannot easily do this.
Depth of water also varies along routes, so vessels of different sizes are needed at different sections.
This means cargo is constantly unloaded and reloaded, causing delays in delivery.
Because of this dependence on water bodies and limited network routes, water transport lacks flexibility.
It is still able to carry bulky goods and a wide range of commodities at a low cost.
Thus, among the given options, the disadvantage is its lack of flexibility.
Answer:C. is not flexible